That is cool but I am not a tech guy. Is this a calc? What does it look like? What does it do? Cool website.

Re: HP71B News??Message #4 Posted by james summers on 5 May 2012, 7:09 a.m.,in response to message #3 by John W Kercheval

Hi John

As I understand it replaces the main CPU board of the HP41 with one with a CPU that can run up to 50 times faster, has additional memory available along with appropriate memory management facilities and, best part of all as far as I am concerned, has the images of 120 or so plug in modules, HEPAX, ZENROM, PPC, etc. built in! Have a look at the list on pages 20 to 25 of the 41CL Manual on the Systemyde site.
The board also has a RS-232C serial port.

When installed in a C or CV it provides all the functions of the CX apart from the Timer functions for which a Time module is required.

The 41CL is a replacement pcb for the CPU board in an HP-41.
You only have to open an HP-41, take out the original CPU board,
and replace it with the 41CL board.
You'll instantly get a super fast HP-41 with lots of memory:-)

VERY COOL. Back in 1985 I modified my 41CV with the capacitor change that doubled speed.

How do you buy this board? What about cosmetic changes to the 41? Like AMG Mercedes you should rework the case to reflect the fact that you have a lot more under the hood... as it were. I'm quite serious about this.

John

Re: HP71B News??Message #7 Posted by james summers on 5 May 2012, 9:20 a.m.,in response to message #6 by John W Kercheval

John

Prices are here and that page has a link to the order form which you can download, complete, and then scan and email Monte Dalrymple at the email address given.

Cheers

James

Re: HP71B News??Message #8 Posted by John W Kercheval on 5 May 2012, 12:07 p.m.,in response to message #7 by james summers

James:

Thanks!

On the subject of speed, if 50X faster that would make the 41CL faster than the HP71B, which is not possible, or desirable. People graduate to the 71B.

The board comes with a replacement front label for the calculator.The board cannot be used with a halfnut, so make sure you havethe right kind of donor calculator. The installation instructionsare covered in the manual, available on the website.